1

Insect bites:
I would recommend that you apply ice directly to the bites and leave the ice in place for up to 30 minutes. Bites often are itchy for up to seven days. Prednisone is probably not a good idea.
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3

Several ideas:
Allergy. Circulatory disturbance. Carpal tunnel or cubital tunnel syndrome. Medication effect. Inflammatory states. With so many possibilities, if symptoms are bothersome or progressive, a medical evaluation is indicated.
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5

Dermatographism:
When the skin welts up after scratching, it is call dermatographism. Antihistamine often helps control this condition. Sometimes dry skin can cause it as well and you may try applying a moisturizer to the area especially right after bathing to see if this helps.
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7

Insect bites:
I would recommend that you apply ice directly to the bites and leave the ice in place for up to 30 minutes. Bites often are itchy for up to seven days. Prednisone is probably not a good idea.
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9

Try:
a virtual consult. Since the forum is for general questions, your question is more appropriate for one-on-one encounter; in which case photos can be shared. There are several common causes for itchy rash like this and answering a few questions will certainly help to clarify what is likely.
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10

Inflammation arm:
Many conditions can cause swelling of the arms, including, but not limited, to an infection, tumor, circulation difficulty, and others. You should see your internal medicine at first, to direct you to the correct specialist.
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